Relating to or characteristic of the Cecidomyiidae family of gall midges; pertaining to insects of this group.
From Cecidomyiidae + the English suffix -ous (full of, characterized by). This adjective form allows scientists to describe traits or organisms belonging to this fly family.
The adjective form shows how scientific language creates precision—'cecidomyiidous' is weird to say, but it instantly tells entomologists you're talking about gall midges specifically.
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